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Title: 2D melting and motility induced phase separation in active Brownian hard disks and dumbbells
Author: Digregorio, Pasquale
Levis, Demian
Suma, Antonio
Cugliandolo, L. F.
Gonnella, Giuseppe
Pagonabarraga Mora, Ignacio
Keywords: Moviment brownià
Punts de fusió
Motilitat cel·lular
Brownian movements
Melting points
Cell motility
Issue Date: 5-May-2019
Publisher: Institute of Physics (IOP)
Abstract: Recently, we characterized the complete phase transition diagram in the -Pe parameter space for two models of active brownian particles in two dimensions. These models are composed of hard disks and dumbbells, respectively, the former being isotropic and the latter anisotropic. Here, we want to outline all the most signi cant features of these two paradigmatic models and compare them. Remarkably, the phase diagrams of the two models are a ected di erently by the introduction of activity. Disks present a two-stage melting scenario from Pe=0 to about Pe=3, with a rst order phase transition between liquid and hexatic and a Berezinskii-Kosterlitz-Thouless transition between hexatic and solid. At higher activities, the three phases are still observed, but the transition between liquid and hexatic becomes a BKT transitions without a distinguishable coexistence region. Dumbbells, instead, present a macroscopic coexistence between hexatically ordered regions and disordered ones, over a nite interval of packing fractions, for all activities, included Pe=0, without any observable discontinuity in the behavior upon increasing Pe.
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It is part of: Journal of Physics: Conference Series, 2019, vol. 1163, p. 012073
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ISSN: 1742-6588
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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